burstone
/ˈbɜrstoʊn/
noun
- A hard, fine-grained stone used for grinding grain or sharpening tools; also called buhrstone.
- The old mill used a large burstone to grind wheat into flour.
- Burstone was prized for its durability and even texture in milling.
- He sharpened his knife on a burstone until the blade was razor-thin.
Synonyms